#ifndef _LINUX_SYSV_FS_H #define _LINUX_SYSV_FS_H /* * The SystemV/Coherent filesystem constants/structures/macros */ /* This code assumes - a little endian processor like 386, - sizeof(short) = 2, sizeof(int) = 4, sizeof(long) = 4, - alignof(short) = 2, alignof(long) = 4. */ #ifdef __GNUC__ #define __packed2__ __attribute__ ((packed, aligned(2))) #else #error I want gcc! #endif #include /* declares S_IFLNK etc. */ #include /* declares wake_up() */ #include /* defines the sv_... shortcuts */ /* Layout on disk */ /* ============== */ /* The block size is sb->sv_block_size which may be smaller than BLOCK_SIZE. */ /* zones (= data allocation units) are blocks */ /* On Coherent FS, 32 bit quantities are stored using (I quote the Coherent manual) a "canonical byte ordering". This is the PDP-11 byte ordering: x = 2^24 * byte3 + 2^16 * byte2 + 2^8 * byte1 + byte0 is stored as { byte2, byte3, byte0, byte1 }. We need conversions. */ typedef u32 coh_ulong; static inline coh_ulong to_coh_ulong (u32 x) { return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); } static inline u32 from_coh_ulong (coh_ulong x) { return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); } /* inode numbers are 16 bit */ typedef u16 sysv_ino_t; /* Block numbers are 24 bit, sometimes stored in 32 bit. On Coherent FS, they are always stored in PDP-11 manner: the least significant 16 bits come last. */ typedef u32 sysv_zone_t; /* Among the blocks ... */ /* Xenix FS, Coherent FS: block 0 is the boot block, block 1 the super-block. SystemV FS: block 0 contains both the boot sector and the super-block. */ /* The first inode zone is sb->sv_firstinodezone (1 or 2). */ /* Among the inodes ... */ /* 0 is non-existent */ #define SYSV_BADBL_INO 1 /* inode of bad blocks file */ #define SYSV_ROOT_INO 2 /* inode of root directory */ /* Xenix super-block data on disk */ #define XENIX_NICINOD 100 /* number of inode cache entries */ #define XENIX_NICFREE 100 /* number of free block list chunk entries */ struct xenix_super_block { u16 s_isize; /* index of first data zone */ u32 s_fsize __packed2__; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ u32 s_free[XENIX_NICFREE]; /* first free block list chunk */ /* the cache of free inodes: */ u16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ /* locks, not used by Linux: */ char s_flock; /* lock during free block list manipulation */ char s_ilock; /* lock during inode cache manipulation */ char s_fmod; /* super-block modified flag */ char s_ronly; /* flag whether fs is mounted read-only */ u32 s_time __packed2__; /* time of last super block update */ u32 s_tfree __packed2__; /* total number of free zones */ u16 s_tinode; /* total number of free inodes */ s16 s_dinfo[4]; /* device information ?? */ char s_fname[6]; /* file system volume name */ char s_fpack[6]; /* file system pack name */ char s_clean; /* set to 0x46 when filesystem is properly unmounted */ char s_fill[371]; s32 s_magic; /* version of file system */ s32 s_type; /* type of file system: 1 for 512 byte blocks 2 for 1024 byte blocks 3 for 2048 byte blocks */ }; /* Xenix free list block on disk */ struct xenix_freelist_chunk { u16 fl_nfree; /* number of free blocks in fl_free, <= XENIX_NICFREE] */ u32 fl_free[XENIX_NICFREE] __packed2__; }; /* SystemV FS comes in two variants: * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). */ #define SYSV_NICINOD 100 /* number of inode cache entries */ #define SYSV_NICFREE 50 /* number of free block list chunk entries */ /* SystemV4 super-block data on disk */ struct sysv4_super_block { u16 s_isize; /* index of first data zone */ u16 s_pad0; u32 s_fsize; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ u16 s_pad1; u32 s_free[SYSV_NICFREE]; /* first free block list chunk */ /* the cache of free inodes: */ u16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ u16 s_pad2; sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ /* locks, not used by Linux: */ char s_flock; /* lock during free block list manipulation */ char s_ilock; /* lock during inode cache manipulation */ char s_fmod; /* super-block modified flag */ char s_ronly; /* flag whether fs is mounted read-only */ u32 s_time; /* time of last super block update */ s16 s_dinfo[4]; /* device information ?? */ u32 s_tfree; /* total number of free zones */ u16 s_tinode; /* total number of free inodes */ u16 s_pad3; char s_fname[6]; /* file system volume name */ char s_fpack[6]; /* file system pack name */ s32 s_fill[12]; s32 s_state; /* file system state: 0x7c269d38-s_time means clean */ s32 s_magic; /* version of file system */ s32 s_type; /* type of file system: 1 for 512 byte blocks 2 for 1024 byte blocks */ }; /* SystemV4 free list block on disk */ struct sysv4_freelist_chunk { u16 fl_nfree; /* number of free blocks in fl_free, <= SYSV_NICFREE] */ u32 fl_free[SYSV_NICFREE]; }; /* SystemV2 super-block data on disk */ struct sysv2_super_block { u16 s_isize; /* index of first data zone */ u32 s_fsize __packed2__; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ u32 s_free[SYSV_NICFREE]; /* first free block list chunk */ /* the cache of free inodes: */ u16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ /* locks, not used by Linux: */ char s_flock; /* lock during free block list manipulation */ char s_ilock; /* lock during inode cache manipulation */ char s_fmod; /* super-block modified flag */ char s_ronly; /* flag whether fs is mounted read-only */ u32 s_time __packed2__; /* time of last super block update */ s16 s_dinfo[4]; /* device information ?? */ u32 s_tfree __packed2__; /* total number of free zones */ u16 s_tinode; /* total number of free inodes */ char s_fname[6]; /* file system volume name */ char s_fpack[6]; /* file system pack name */ s32 s_fill[14]; s32 s_state; /* file system state: 0xcb096f43 means clean */ s32 s_magic; /* version of file system */ s32 s_type; /* type of file system: 1 for 512 byte blocks 2 for 1024 byte blocks */ }; /* SystemV2 free list block on disk */ struct sysv2_freelist_chunk { u16 fl_nfree; /* number of free blocks in fl_free, <= SYSV_NICFREE] */ u32 fl_free[SYSV_NICFREE] __packed2__; }; /* Coherent super-block data on disk */ #define COH_NICINOD 100 /* number of inode cache entries */ #define COH_NICFREE 64 /* number of free block list chunk entries */ struct coh_super_block { u16 s_isize; /* index of first data zone */ coh_ulong s_fsize __packed2__; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ coh_ulong s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ /* the cache of free inodes: */ u16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ /* locks, not used by Linux: */ char s_flock; /* lock during free block list manipulation */ char s_ilock; /* lock during inode cache manipulation */ char s_fmod; /* super-block modified flag */ char s_ronly; /* flag whether fs is mounted read-only */ coh_ulong s_time __packed2__; /* time of last super block update */ coh_ulong s_tfree __packed2__; /* total number of free zones */ u16 s_tinode; /* total number of free inodes */ u16 s_interleave_m; /* interleave factor */ u16 s_interleave_n; char s_fname[6]; /* file system volume name */ char s_fpack[6]; /* file system pack name */ u32 s_unique; /* zero, not used */ }; /* Coherent free list block on disk */ struct coh_freelist_chunk { u16 fl_nfree; /* number of free blocks in fl_free, <= COH_NICFREE] */ u32 fl_free[COH_NICFREE] __packed2__; }; /* SystemV/Coherent inode data on disk */ struct sysv_inode { u16 i_mode; u16 i_nlink; u16 i_uid; u16 i_gid; u32 i_size; union { /* directories, regular files, ... */ unsigned char i_addb[3*(10+1+1+1)+1]; /* zone numbers: max. 10 data blocks, * then 1 indirection block, * then 1 double indirection block, * then 1 triple indirection block. * Then maybe a "file generation number" ?? */ /* devices */ dev_t i_rdev; /* named pipes on Coherent */ struct { char p_addp[30]; s16 p_pnc; s16 p_prx; s16 p_pwx; } i_p; } i_a; u32 i_atime; /* time of last access */ u32 i_mtime; /* time of last modification */ u32 i_ctime; /* time of creation */ }; /* The admissible values for i_mode are listed in : * #define S_IFMT 00170000 mask for type * #define S_IFREG 0100000 type = regular file * #define S_IFBLK 0060000 type = block device * #define S_IFDIR 0040000 type = directory * #define S_IFCHR 0020000 type = character device * #define S_IFIFO 0010000 type = named pipe * #define S_ISUID 0004000 set user id * #define S_ISGID 0002000 set group id * #define S_ISVTX 0001000 save swapped text even after use * Additionally for SystemV: * #define S_IFLNK 0120000 type = symbolic link * #define S_IFNAM 0050000 type = XENIX special named file ?? * Additionally for Coherent: * #define S_IFMPB 0070000 type = multiplexed block device ?? * #define S_IFMPC 0030000 type = multiplexed character device ?? * * Since Coherent doesn't know about symbolic links, we use a kludgey * implementation of symbolic links: i_mode = COH_KLUDGE_SYMLINK_MODE * denotes a symbolic link. When a regular file should get this mode by * accident, it is automatically converted to COH_KLUDGE_NOT_SYMLINK. * We use S_IFREG because only regular files (and Coherent pipes...) can have * data blocks with arbitrary contents associated with them, and S_ISVTX * ("save swapped text after use") because it is unused on both Linux and * Coherent: Linux does much more intelligent paging, and Coherent hasn't * virtual memory at all. * Same trick for Xenix. */ #define COH_KLUDGE_SYMLINK_MODE (S_IFREG | S_ISVTX) #define COH_KLUDGE_NOT_SYMLINK (S_IFREG | S_ISVTX | S_IRUSR) /* force read access */ extern inline mode_t from_coh_imode(unsigned short mode) { if (mode == COH_KLUDGE_SYMLINK_MODE) return (S_IFLNK | 0777); else return mode; } extern inline unsigned short to_coh_imode(mode_t mode) { if (S_ISLNK(mode)) return COH_KLUDGE_SYMLINK_MODE; else if (mode == COH_KLUDGE_SYMLINK_MODE) return COH_KLUDGE_NOT_SYMLINK; else return mode; } /* Admissible values for i_nlink: 0.._LINK_MAX */ #define XENIX_LINK_MAX 126 /* ?? */ #define SYSV_LINK_MAX 126 /* 127? 251? */ #define COH_LINK_MAX 10000 /* max number of hard links to an inode */ /* The number of inodes per block is sb->sv_inodes_per_block = block_size / sizeof(struct sysv_inode) */ /* The number of indirect pointers per block is sb->sv_ind_per_block = block_size / sizeof(u32) */ /* SystemV/Coherent directory entry on disk */ #define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ struct sysv_dir_entry { sysv_ino_t inode; char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ }; #define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ /* Operations */ /* ========== */ /* identify the FS in memory */ #define FSTYPE_XENIX 1 #define FSTYPE_SYSV4 2 #define FSTYPE_SYSV2 3 #define FSTYPE_COH 4 #define SYSV_MAGIC_BASE 0x012FF7B3 #define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX) #define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4) #define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2) #define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH) #ifdef __KERNEL__ /* sv_get_hash_table(sb,dev,block) is equivalent to get_hash_table(dev,block,block_size) */ static inline struct buffer_head * sv_get_hash_table (struct super_block *sb, kdev_t dev, unsigned int block) { return get_hash_table (dev, block + sb->sv_block_base, sb->sv_block_size); } /* sv_getblk(sb,dev,block) is equivalent to getblk(dev,block,block_size) */ static inline struct buffer_head * sv_getblk (struct super_block *sb, kdev_t dev, unsigned int block) { return getblk (dev, block + sb->sv_block_base, sb->sv_block_size); } /* sv_bread(sb,dev,block) is equivalent to bread(dev,block,block_size) */ static inline struct buffer_head * sv_bread (struct super_block *sb, kdev_t dev, unsigned int block) { return bread (dev, block + sb->sv_block_base, sb->sv_block_size); } /* * Function prototypes */ extern struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry); extern int sysv_create(struct inode * dir, struct dentry * dentry, int mode); extern int sysv_mkdir(struct inode * dir, struct dentry * dentry, int mode); extern int sysv_rmdir(struct inode * dir, struct dentry * dentry); extern int sysv_unlink(struct inode * dir, struct dentry * dentry); extern int sysv_symlink(struct inode * inode, struct dentry * dentry, const char * symname); extern int sysv_link(struct dentry * old_dentry, struct inode * dir, struct dentry * dentry); extern int sysv_mknod(struct inode * dir, struct dentry * dentry, int mode, int rdev); extern int sysv_rename(struct inode * old_dir, struct dentry * old_dentry, struct inode * new_dir, struct dentry * new_dentry); extern struct inode * sysv_new_inode(const struct inode * dir); extern void sysv_free_inode(struct inode * inode); extern unsigned long sysv_count_free_inodes(struct super_block *sb); extern int sysv_new_block(struct super_block * sb); extern void sysv_free_block(struct super_block * sb, unsigned int block); extern unsigned long sysv_count_free_blocks(struct super_block *sb); extern int sysv_get_block(struct inode *, long, struct buffer_head *, int); extern struct buffer_head * sysv_file_bread(struct inode *, int, int); extern void sysv_truncate(struct inode *); extern int init_sysv_fs(void); extern void sysv_write_inode(struct inode *); extern int sysv_sync_inode(struct inode *); extern int sysv_sync_file(struct file *, struct dentry *); extern struct inode_operations sysv_file_inode_operations; extern struct inode_operations sysv_file_inode_operations_with_bmap; extern struct inode_operations sysv_dir_inode_operations; extern struct inode_operations sysv_symlink_inode_operations; #endif /* __KERNEL__ */ #endif